package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类
     * @param id
     */
    @Override
    public void remove(Long id) {
        //查询id是否已经关联了菜品或者套餐

        //关联菜品？
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);

        int count = dishService.count(dishLambdaQueryWrapper);

        //如果关联了菜品
        if(count > 0)
        {
            //抛出业务异常
            throw new CustomException("当前分类已关联菜品，不能删除");
        }

        //关联套餐？
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);

        int count1 = setmealService.count(setmealLambdaQueryWrapper);

        //如果关联了套餐
        if(count1 > 0)
        {
            //抛出业务异常
            throw new CustomException("当前分类已关联套餐，不能删除");
        }

        //删除
        super.removeById(id);

    }
}
